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EP0648477A2 - Drill head for the medullary canal - Google Patents

Drill head for the medullary canal Download PDF

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Publication number
EP0648477A2
EP0648477A2 EP94113033A EP94113033A EP0648477A2 EP 0648477 A2 EP0648477 A2 EP 0648477A2 EP 94113033 A EP94113033 A EP 94113033A EP 94113033 A EP94113033 A EP 94113033A EP 0648477 A2 EP0648477 A2 EP 0648477A2
Authority
EP
European Patent Office
Prior art keywords
medullary
boring head
head according
slots
rear part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94113033A
Other languages
German (de)
French (fr)
Other versions
EP0648477A3 (en
EP0648477B1 (en
Inventor
Christof Müller
Peter Christen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AO Technology AG
Original Assignee
Synthes AG Chur
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Synthes AG Chur filed Critical Synthes AG Chur
Publication of EP0648477A2 publication Critical patent/EP0648477A2/en
Publication of EP0648477A3 publication Critical patent/EP0648477A3/en
Application granted granted Critical
Publication of EP0648477B1 publication Critical patent/EP0648477B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/164—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans intramedullary
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1613—Component parts
    • A61B17/1615—Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72—Intramedullary pins, nails or other devices

Definitions

  • the invention relates to a medullary boring head according to the preamble of patent claim 1.
  • the medullary cavity In osteosynthetic nailing of fractured long bones, the medullary cavity must be drilled out before the intramedullary nail is implanted.
  • a drill mandrel is first passed through the medullary segment of the individual bone fragments, over which a hollow, flexible drill shaft with a fixed drill head is then advanced.
  • the drilling shaft is driven by a motor, mostly by means of a pneumatic drilling machine.
  • a flexible shaft with interchangeable medullary boring heads with different outer diameters is used for the final drilling of the medullary canal.
  • the marrow boring heads can be attached to or detached from the flexible shaft in a rotationally fixed manner by means of a simple coupling.
  • the temperature rise during the drilling process - with peak values of up to 50 ° C - is also undesirable.
  • the invention seeks to remedy this.
  • the invention has for its object to provide a medullary boring head which allows the hydraulic pressure to be dissipated in the distal fracture fragment during the drilling of the medullary canal.
  • the invention solves the problem with a medullary boring head, which has the features of claim 1. Further advantageous embodiments of the invention are characterized in the dependent claims.
  • the wall thickness of the casing of the hollow rotating body is expediently approximately 1 mm.
  • the front part 1 and the rear part 3 (with coupling part 4) each have an outlet opening 7 or 8 through which a drill mandrel (not shown in the drawing) or a drill guide with the same diameter (of approximately 3 mm) can be inserted.
  • three openings 5 are made in the lateral surface 6 of the hollow rotating body in the form of 120 ° offset, spiral-shaped slots.
  • the angular distance ⁇ - as shown in FIG. 2 - between two identical points, for example the center or one of the two ends, of two adjacent slots is 120 °.
  • openings 5 'in the form of 120 ° offset, spiral slots are also made in the rear part 3 and in the adjacent section of the middle part 2.
  • the slots of the rear part 3 are slightly widened (as in the form of a spherical recess), as indicated at point 11, in order to prevent the medullary boring head from becoming blocked.
  • the pitch angle is gamma, i.e. the inclination of the spiral slots relative to the longitudinal axis of the medullary boring head, in the range between 20 ° and 40 °, preferably between 25 ° and 35 ° and is typically 30 °.
  • the openings 5, 5 'in the form of slots are designed in such a way that they have cutting edges 10, analogous to a scraper, the edges 10 directed towards the coupling part 4 preferably being increased radially, for example by bending them over.
  • the coupling part 4 is designed according to the prior art and can be equipped with any suitable coupling system for the drilling shaft to be fastened to it.
  • the two halves of the hollow rotating body can be produced separately and then connected to one another along the weld seam 9.
  • the wall thickness of the casing of the hollow rotating body can be between 0.5 and 2 mm, preferably between 0.8 and 1.2 mm.
  • the medullary boring head is expediently hollowed out to at least 50%, preferably at least 70%, of its total volume.

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  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Animal Behavior & Ethology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Dentistry (AREA)
  • Molecular Biology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)

Abstract

The drill head for the medullary canal is intended to open the medullary canal of a tubular bone for osteosynthetic nailing of fractured tubular bones. It possesses a front member (1), a central member (2), a rear member (3) and a coupling member (4) connected to the rear member for the releasable fastening on a driveable, flexible drill shaft. The drill head for the medullary canal is designed as a hollow rotational body and in its front member (1) and in its rear member (3) it has three openings (5) each in the form of slots cut spirally in the surface (6) of the hollow rotational body. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Markraumbohrkopf gemäss dem Oberbegriff des Patentanspruchs 1.The invention relates to a medullary boring head according to the preamble of patent claim 1.

Bei der osteosynthetischen Nagelung von frakturierten Röhrenknochen muss vor der Implantation des Marknagels die Markhöhle aufgebohrt werden. Zu diesem Zweck wird vorerst ein Bohrdorn durch die Markraumsegmente der einzelnen Knochenfragmente hindurchgeführt, über welchen dann eine hohle, flexible Bohrwelle mit festem Bohrkopf vorgeschoben wird. Der Antrieb der Bohrwelle erfolgt motorisch, zumeist mittels einer pneumatischen Bohrmaschine. Danach wird eine flexible Welle mit austauschbaren Markraumbohrköpfen mit verschieden grossem Aussendurchmesser zum definitiven Aufbohren des Markraumes eingesetzt. Die Markraumbohrköpfe können mittels einer einfachen Kupplung drehfest an der flexiblen Welle befestig, bzw. von dieser gelöst werden.In osteosynthetic nailing of fractured long bones, the medullary cavity must be drilled out before the intramedullary nail is implanted. For this purpose, a drill mandrel is first passed through the medullary segment of the individual bone fragments, over which a hollow, flexible drill shaft with a fixed drill head is then advanced. The drilling shaft is driven by a motor, mostly by means of a pneumatic drilling machine. Then a flexible shaft with interchangeable medullary boring heads with different outer diameters is used for the final drilling of the medullary canal. The marrow boring heads can be attached to or detached from the flexible shaft in a rotationally fixed manner by means of a simple coupling.

Da die Markraumbohrköpfe nach dem Stand der Technik - abgesehen vom durchlaufenden Kanal für den Bohrdorn, welcher durch diesen selbst verschlossen wird - solide ausgeführt sind, wird beim Aufbohrvorgang ein erheblicher metaphysärer und radialer Druck innerhalb des Markraumes des distalen Frakturfragmentes erzeugt. Dabei können Spitzenwerte für den Druck bis zu 1500 mm Hg auftreten.Since the medullary boring heads according to the prior art - apart from the continuous channel for the drilling mandrel, which is itself closed by this - are solid, a considerable metaphyseal and radial pressure is created during the boring process generated within the medullary canal of the distal fracture fragment. Peak values for pressure up to 1500 mm Hg can occur.

Die enorme Druckerhöhung bedingt eine Markfett-Einpressung in die transcorticalen Gefässe, was sich nachteilig auf die Frakturheilung auswirkt, denn die transcorticalen Gefässe werden nicht nur durch den Bohrvorgang selbst, sondern auch noch durch die Verlegung mit Markfett in ihrer Funktion beeinträchtigt. Des weiteren kommt es zu druckbedingten Fetteinschwemmungen in das abführende venöse System, was zu Fettembolien führen kann.The enormous increase in pressure necessitates an intrusion of marrow fat into the transcortical vessels, which has a disadvantageous effect on fracture healing, because the function of the transcortical vessels is affected not only by the drilling process itself but also by the laying with marrow fat. In addition, there is pressure-induced fat flushing into the laxative venous system, which can lead to fat embolism.

Auch der beim Bohrvorgang auftretende Temperaturanstieg - mit Spitzenwerten bis zu 50°C - ist unerwünscht.The temperature rise during the drilling process - with peak values of up to 50 ° C - is also undesirable.

Schliesslich kommt es auch häufig zu einer Verklemmung des Bohrkopfs im Markraum, der dann mit geeigneten Instrumenten wieder herausgeschlagen werden muss.Finally, the drill head is often jammed in the medullary canal, which must then be knocked out with suitable instruments.

Hier will die Erfindung Abhilfe schaffen. Der Erfindung liegt die Aufgabe zugrunde, einen Markraumbohrkopf zu schaffen, der die Abführung des hydraulischen Druckes im distalen Frakturfragment während der Aufbohrung des Markraumes gestattet.The invention seeks to remedy this. The invention has for its object to provide a medullary boring head which allows the hydraulic pressure to be dissipated in the distal fracture fragment during the drilling of the medullary canal.

Die Erfindung löst die gestellte Aufgabe mit einem Markraumbohrkopf, welcher die Merkmale des Anspruchs 1 aufweist. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen gekennzeichnet.The invention solves the problem with a medullary boring head, which has the features of claim 1. Further advantageous embodiments of the invention are characterized in the dependent claims.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass dank des erfindungsgemässen Markraumbohrkopfes der beim Bohrvorgang vor dem Bohrkopf auftretende Druck durch die dazu vorgesehenen Öffnungen durch den hohlen Bohrkopf nach hinten abgeführt werden kann.The advantages achieved by the invention are essentially to be seen in the fact that, thanks to the medullary boring head according to the invention, the pressure which occurs during the boring process in front of the boring head can be discharged through the openings provided for this purpose through the hollow boring head.

Die Erfindung wird im folgenden anhand einer Darstellung eines bevorzugten Ausführungsbeispiels noch näher erläutert.The invention is explained in more detail below with the aid of a representation of a preferred exemplary embodiment.

Es zeigt:

  • Fig. 1 eine perspektivische Darstellung des erfindungsgemässen Markraumbohrkopfes;
  • Fig. 2 eine schematische Vorderansicht des Markraumbohrkopfes nach Fig. 1 mit Darstellung der Grösse und Winkellage der Öffnungen, die symbolisch angedeutet sind;
  • Fig. 3 eine schematische Vorderansicht einer Variante des Markraumbohrkopfes nach Fig. 2; und
  • Fig. 4 eine vereinfachte, schematische Seitenansicht des Markraumbohrkopfes nach Fig. 1 mit Darstellung der Winkellage einer der Öffnungen.
It shows:
  • 1 is a perspective view of the medullary boring head according to the invention;
  • FIG. 2 shows a schematic front view of the medullary boring head according to FIG. 1, showing the size and angular position of the openings, which are indicated symbolically;
  • 3 shows a schematic front view of a variant of the medullary boring head according to FIG. 2; and
  • Fig. 4 is a simplified, schematic side view of the medullary boring head according to Fig. 1, showing the angular position of one of the openings.

Der in Fig. 1 dargestellte Markraumbohrkopf besteht im wesentlichen aus einem hohlen Rotationskörper mit einem kegelstumpfförmigen Stirnteil 1, einem Mittelteil 2, einem kegelstumpfförmigen Hinterteil 3 und einem am Hinterteil 3 anschliessenden Kupplungsteil 4 zur lösbaren Befestigung an eine (zeichnerisch nicht dargestellte) antreibbare, flexible Bohrwelle. Die Wandstärke des Mantels des hohlen Rotationskörpers beträgt zweckmässigerweise ca. 1 mm.1 consists essentially of a hollow rotating body with a frustoconical front part 1, a central part 2, a frustoconical rear part 3 and a coupling part 4 adjoining the rear part 3 for releasable attachment to a drivable, flexible drilling shaft (not shown in the drawing) . The wall thickness of the casing of the hollow rotating body is expediently approximately 1 mm.

Der Stirnteil 1 und der Hinterteil 3 (mit Kupplungsteil 4) besitzen je eine Austrittsöffnung 7, bzw. 8, durch welche ein (zeichnerisch nicht dargestellter) Bohrdorn oder eine Bohrerführung mit gleichem Durchmesser (von ca. 3 mm) gesteckt werden kann.The front part 1 and the rear part 3 (with coupling part 4) each have an outlet opening 7 or 8 through which a drill mandrel (not shown in the drawing) or a drill guide with the same diameter (of approximately 3 mm) can be inserted.

Im Stirnteil 1 sowie im daran angrenzenden Abschnitt des Mittelteils 2 sind in der Mantelfläche 6 des hohlen Rotationskörpers drei Öffnungen 5 in Form von um 120° versetzt angeordneten, spiralförmig verlaufenden Schlitzen angebracht. Mit anderen Worten beträgt der Winkelabstand α - wie in Fig. 2 dargestellt - zwischen zwei identischen Punkten, beispielsweise das Zentrum oder eines der beiden Enden, zweier benachbarter Schlitze 120°.In the front part 1 and in the adjoining section of the middle part 2, three openings 5 are made in the lateral surface 6 of the hollow rotating body in the form of 120 ° offset, spiral-shaped slots. In other words, the angular distance α - as shown in FIG. 2 - between two identical points, for example the center or one of the two ends, of two adjacent slots is 120 °.

Annähernd symmetrisch dazu sind im Hinterteil 3 sowie im angrenzenden Abschnitt des Mittelteils 2 ebenfalls drei Öffnungen 5' in Form von um 120° versetzten, spiralförmig verlaufenden Schlitzen angebracht. Wie in Fig. 2 dargestellt erstrecken sich die Öffnungen 5,5' über einen Sektor β von 60° - 120°, vorzugsweise von 80° - 100° und typischerweise von 90°. An ihrem hinteren Ende sind die Schlitze des Hinterteils 3 wie an der Stelle 11 angedeutet etwas erweitert (z.B. in Form einer sphärischen Ausnehmung) um eine Verstopfung des Markraumbohrkopfs zu verhindern.Approximately symmetrically to this, three openings 5 'in the form of 120 ° offset, spiral slots are also made in the rear part 3 and in the adjacent section of the middle part 2. As shown in Fig. 2, the openings 5,5 'extend over a sector β from 60 ° to 120 °, preferably from 80 ° to 100 ° and typically from 90 °. At its rear end, the slots of the rear part 3 are slightly widened (as in the form of a spherical recess), as indicated at point 11, in order to prevent the medullary boring head from becoming blocked.

Wie in Fig. 4 dargestellt liegt der Steigungswinkel gamma, d.h. die Inklination der spiralförmig verlaufenden Schlitze relativ zur Längsachse des Markraumbohrkopfes, im Bereich zwischen 20° und 40°, vorzugsweise zwischen 25° und 35° und beträgt typischerweise 30°.As shown in Fig. 4, the pitch angle is gamma, i.e. the inclination of the spiral slots relative to the longitudinal axis of the medullary boring head, in the range between 20 ° and 40 °, preferably between 25 ° and 35 ° and is typically 30 °.

Anstelle der drei um 120° versetzten Schlitze können - wie in Fig. 3 dargestellt - auch zwei um 180° versetzte Schlitze verwendet werden.Instead of the three slots offset by 120 °, two slots offset by 180 ° can also be used, as shown in FIG. 3.

Die Öffnungen 5,5' im Form von Schlitzen sind derart ausgebildet, dass sie schneidende Kanten 10 aufweisen, analog zu einer Raffel, wobei vorzugsweise die zum Kupplungsteil 4 gerichteten Kanten 10 radial erhöht sind, beispielsweise durch Umbiegen derselben.The openings 5, 5 'in the form of slots are designed in such a way that they have cutting edges 10, analogous to a scraper, the edges 10 directed towards the coupling part 4 preferably being increased radially, for example by bending them over.

Der Kupplungsteil 4 ist gemäss dem Stand der Technik ausgebildet und kann mit irgend einem geeigneten Kupplungssystem für die daran zu befestigende Bohrwelle ausgestattet werden.The coupling part 4 is designed according to the prior art and can be equipped with any suitable coupling system for the drilling shaft to be fastened to it.

Fabrikationstechnisch lassen sich die beiden Hälften des hohlen Rotationskörpers getrennt herstellen und dann längs der Schweissnaht 9 miteinander verbinden.In terms of manufacturing technology, the two halves of the hollow rotating body can be produced separately and then connected to one another along the weld seam 9.

Die Wandstärke des Mantels des hohlen Rotationskörpers kann zwischen 0,5 und 2 mm, vorzugsweise zwischen 0,8 und 1,2 mm betragen.The wall thickness of the casing of the hollow rotating body can be between 0.5 and 2 mm, preferably between 0.8 and 1.2 mm.

Der Markraumbohrkopf ist zweckmässigerweise zu mindestens 50%, vorzugsweise mindestens 70% seines Gesamtvolumens ausgehölt.The medullary boring head is expediently hollowed out to at least 50%, preferably at least 70%, of its total volume.

Claims (10)

Markraumbohrkopf zum Aufbohren der Markhöhle eines Röhrenknochens mit einem Stirnteil (1), einem Mittelteil (2), einem Hinterteil (3) und einem am Hinterteil anschliessenden Kupplungsteil (4) zur lösbaren Befestigung an eine antreibbare Bohrwelle, dadurch gekennzeichnet, dass der Markraumbohrkopf als hohler Rotationskörper ausgebildet ist und mindestens im Stirnteil (1) und im Hinterteil (3) eine oder mehrere Öffnungen (5) in der Mantelfläche (6) des hohlen Rotationskörper vorgesehen sind.Medullary boring head for drilling out the medullary cavity of a long bone with a front part (1), a middle part (2), a rear part (3) and a coupling part (4) adjoining the rear part for releasable attachment to a drivable drilling shaft, characterized in that the medullary boring head is hollow Rotary body is formed and at least in the front part (1) and in the rear part (3) one or more openings (5) are provided in the lateral surface (6) of the hollow rotating body. Markraumbohrkopf nach Anspruch 1, dadurch gekennzeichnet, dass der Stirnteil (1) und vorzugsweise auch der Hinterteil (3) als Hohlkegelstumpf ausgebildet ist.Medullary boring head according to claim 1, characterized in that the end part (1) and preferably also the rear part (3) is designed as a hollow truncated cone. Markraumbohrkopf nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Öffnungen (5) im Form von spiralförmig in der Mantelfläche (6) angeordneten Schlitzen realisiert sind, deren zum Kupplungsteil (4) gerichteten Kanten (10) vorzugsweise schneidend ausgebildet sind.Medullary boring head according to claim 1 or 2, characterized in that the openings (5) are realized in the form of slots arranged spirally in the lateral surface (6), the edges (10) of which are directed towards the coupling part (4) are preferably designed to be cutting. Markraumbohrkopf nach Anspruch 3, dadurch gekennzeichnet, dass im Stirnteil (1) sowie im daran angrenzenden Abschnitt des Mittelteils (2) zwei um 180° gegeneinander versetzte Schlitze und im Hinterteil (3) sowie im angrenzenden Abschnitt des Mittelteils (2) ebenfalls zwei um 180° versetzte Schlitze angeordnet sind.Medullary boring head according to claim 3, characterized in that in the front part (1) and in the adjoining section of the middle part (2) two slots offset by 180 ° and in the rear part (3) and in the adjoining section of the middle part (2) also two by 180 ° offset slots are arranged. Markraumbohrkopf nach Anspruch 3, dadurch gekennzeichnet, dass im Stirnteil (1) sowie im daran angrenzenden Abschnitt des Mittelteils (2) drei um 120° versetzte Schlitze und im Hinterteil (3) sowie im angrenzenden Abschnitt des Mittelteils (2) ebenfalls drei um 120° versetzte Schlitze angeordnet sind.Medullary boring head according to claim 3, characterized in that in the front part (1) and in the adjacent section of the central part (2) three slots offset by 120 ° and in the rear part (3) and in the adjacent section of the central part (2) also three by 120 ° staggered slots are arranged. Markraumbohrkopf nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die spiralförmig angeordneten Schlitze einen Steigungswinkel von 20° - 40°, vorzugsweise von 25° - 35° aufweisen.Medullary boring head according to one of claims 3 to 5, characterized in that the spirally arranged slots have a pitch angle of 20 ° - 40 °, preferably of 25 ° - 35 °. Markraumbohrkopf nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass die spiralförmig angeordneten Schlitze sich über einen radialen Drehwinkel von 60° - 120°, vorzugsweise von 80° - 100° erstrecken.Medullary boring head according to one of claims 3 to 6, characterized in that the spirally arranged slots extend over a radial angle of rotation of 60 ° to 120 °, preferably from 80 ° to 100 °. Markraumbohrkopf nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Stärke des Mantels zwischen 0,5 und 2 mm, vorzugsweise zwischen 0,8 und 1,2 mm liegt.Medullary boring head according to one of claims 1 to 7, characterized in that the thickness of the casing is between 0.5 and 2 mm, preferably between 0.8 and 1.2 mm. Markraumbohrkopf nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Stirnteil 1 und der Kupplungsteil 4 beide eine Austrittsöffnung 7, bzw. 8 aufweisen, durch welche in axialer Richtung ein Bohrdorn führbar ist.Medullary boring head according to one of claims 1 to 8, characterized in that the end part 1 and the coupling part 4 both have an outlet opening 7 or 8, through which a drilling mandrel can be guided in the axial direction. Markraumbohrkopf nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass mindestens 50%, vorzugsweise mindestens 70% seines Gesamtvolumens ausgehöhlt ist.Medullary boring head according to one of claims 1 to 9, characterized in that at least 50%, preferably at least 70% of its total volume is hollowed out.
EP94113033A 1993-09-15 1994-08-20 Drill head for the medullary canal Expired - Lifetime EP0648477B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH277493 1993-09-15
CH02774/93A CH687228A5 (en) 1993-09-15 1993-09-15 Drill head.
CH2774/93 1993-09-15

Publications (3)

Publication Number Publication Date
EP0648477A2 true EP0648477A2 (en) 1995-04-19
EP0648477A3 EP0648477A3 (en) 1995-09-13
EP0648477B1 EP0648477B1 (en) 1999-12-29

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EP94113033A Expired - Lifetime EP0648477B1 (en) 1993-09-15 1994-08-20 Drill head for the medullary canal

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US (1) US5690634A (en)
EP (1) EP0648477B1 (en)
JP (1) JP3325402B2 (en)
AU (1) AU669999B2 (en)
CA (1) CA2131610C (en)
CH (1) CH687228A5 (en)
DE (1) DE59409035D1 (en)
ES (1) ES2142367T3 (en)
FI (1) FI944270A (en)
NO (1) NO943416L (en)

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WO1998049948A1 (en) * 1997-05-06 1998-11-12 Orthofix S.R.L. Medullary-cavity drill head
EP0965308A1 (en) * 1998-06-17 1999-12-22 Precifar S.A. Surgical reamer
US6987336B2 (en) * 2002-09-30 2006-01-17 EBM—Papst Mulfingen GmbH & Co. KG Electric motor with screwless plug-type mounting
WO2013037673A1 (en) 2011-09-16 2013-03-21 CHIRMAT Sàrl Surgical tool for reaming the diaphyseal canal of long bones

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WO2000045714A1 (en) 1999-02-03 2000-08-10 Synthes Ag Chur Surgical reamer and method of using same
US7018380B2 (en) * 1999-06-10 2006-03-28 Cole J Dean Femoral intramedullary rod system
US6540752B1 (en) * 1999-11-01 2003-04-01 Greg Hicken Threaded bone tunnel dilator
US6579298B1 (en) * 2000-02-29 2003-06-17 Scimed Life Systems, Inc. Method and apparatus for treating vein graft lesions
DE20006247U1 (en) 2000-04-05 2000-08-17 Joist, Alexander, Dr., 49808 Lingen Core drills, in particular medullary bone drills
US6527775B1 (en) 2000-09-22 2003-03-04 Piper Medical, Inc. Intramedullary interlocking fixation device for the distal radius
US6783533B2 (en) 2001-11-21 2004-08-31 Sythes Ag Chur Attachable/detachable reaming head for surgical reamer
US20030163135A1 (en) * 2002-02-22 2003-08-28 Hathaway Ray W. Orthopeadic reamer with see-through viewing windows
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CA2131610C (en) 2000-11-14
JPH0779984A (en) 1995-03-28
EP0648477A3 (en) 1995-09-13
DE59409035D1 (en) 2000-02-03
FI944270A (en) 1995-03-16
AU7033794A (en) 1995-04-13
CA2131610A1 (en) 1995-03-16
EP0648477B1 (en) 1999-12-29
ES2142367T3 (en) 2000-04-16
AU669999B2 (en) 1996-06-27
JP3325402B2 (en) 2002-09-17
FI944270A0 (en) 1994-09-15
CH687228A5 (en) 1996-10-31
NO943416D0 (en) 1994-09-14
NO943416L (en) 1995-03-16
US5690634A (en) 1997-11-25

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